Motion track image does't appear in render
The images used in the workspace are for reference only.
Go to compositing workspace, check Use Nodes and thenShift + A &gt; Image Sequence.
Then Shift + A &gt; Viewer and connect image sequence to the viewer and Composior node. If the image size doesn't fit, you can try to use Scale node, I am not that sure if that's the right name
The basic node setup for tracking is described here:
Transparent rendered object over tracked background